5kg of air undergoes two processes in a piston- cylinder device. the first process is an isobaric compression process from 1 bar, 600 k to a volume that is 1/2 of the original volume. the second process is a reversible, adiabatic expansion process back to its original volume. the boundary of the piston-cylinder can be taken as the surroundings temperature which is 290 k.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

What precautions should you take to prevent injuries when dealing with heavy loads?

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false